Billy the Yorkshire Terrier: the world's oldest dog?

A Yorkshire Terrier from Halifax called Billy could be set to claim the title of the world's oldest dog, after reaching the age of 22. Billy the Yorkshire Terrier: the world's oldest dog? (Picture: Ross Parry)Billy may be a venerable 154 years old in dog years, is blind in one eye and only has a few teeth left - but he's still energetic and active, going out for two walks a day and regularly